src/HOL/ex/Eval_Examples.thy

datatype num = One | Dig0 num | Dig1 num

(*  ID:         $Id$
    Author:     Florian Haftmann, TU Muenchen
*)

header {* Small examples for evaluation mechanisms *}

theory Eval_Examples
imports Code_Eval Rational
begin

text {* evaluation oracle *}

lemma "True \<or> False" by eval
lemma "\<not> (Suc 0 = Suc 1)" by eval
lemma "[] = ([]\<Colon> int list)" by eval
lemma "[()] = [()]" by eval
lemma "fst ([]::nat list, Suc 0) = []" by eval

text {* SML evaluation oracle *}

lemma "True \<or> False" by evaluation
lemma "\<not> (Suc 0 = Suc 1)" by evaluation
lemma "[] = ([]\<Colon> int list)" by evaluation
lemma "[()] = [()]" by evaluation
lemma "fst ([]::nat list, Suc 0) = []" by evaluation

text {* normalization *}

lemma "True \<or> False" by normalization
lemma "\<not> (Suc 0 = Suc 1)" by normalization
lemma "[] = ([]\<Colon> int list)" by normalization
lemma "[()] = [()]" by normalization
lemma "fst ([]::nat list, Suc 0) = []" by normalization

text {* term evaluation *}

value "(Suc 2 + 1) * 4"
value [code] "(Suc 2 + 1) * 4"
value [SML] "(Suc 2 + 1) * 4"
value [nbe] "(Suc 2 + 1) * 4"

value "(Suc 2 + Suc 0) * Suc 3"
value [code] "(Suc 2 + Suc 0) * Suc 3"
value [SML] "(Suc 2 + Suc 0) * Suc 3"
value [nbe] "(Suc 2 + Suc 0) * Suc 3"

value "nat 100"
value [code] "nat 100"
value [SML] "nat 100"
value [nbe] "nat 100"

value "(10\<Colon>int) \<le> 12"
value [code] "(10\<Colon>int) \<le> 12"
value [SML] "(10\<Colon>int) \<le> 12"
value [nbe] "(10\<Colon>int) \<le> 12"

value "max (2::int) 4"
value [code] "max (2::int) 4"
value [SML] "max (2::int) 4"
value [nbe] "max (2::int) 4"

value "of_int 2 / of_int 4 * (1::rat)"
value [code] "of_int 2 / of_int 4 * (1::rat)"
value [SML] "of_int 2 / of_int 4 * (1::rat)"
value [nbe] "of_int 2 / of_int 4 * (1::rat)"

value "[]::nat list"
value [code] "[]::nat list"
value [SML] "[]::nat list"
value [nbe] "[]::nat list"

value "[(nat 100, ())]"
value [code] "[(nat 100, ())]"
value [SML] "[(nat 100, ())]"
value [nbe] "[(nat 100, ())]"


text {* a fancy datatype *}

datatype ('a, 'b) bair =
    Bair "'a\<Colon>order" 'b
  | Shift "('a, 'b) cair"
  | Dummy unit
and ('a, 'b) cair =
    Cair 'a 'b

value "Shift (Cair (4::nat) [Suc 0])"
value [code] "Shift (Cair (4::nat) [Suc 0])"
value [SML] "Shift (Cair (4::nat) [Suc 0])"
value [nbe] "Shift (Cair (4::nat) [Suc 0])"

end